TY - JOUR
T1 - Characterization of Bacillus luciferensis strain KJ2C12 from pepper root, a biocontrol agent of Phytophthora blight of pepper
AU - Kim, Hye Sook
AU - Sang, Mee Kyung
AU - Myung, Inn Shik
AU - Chun, Se Chul
AU - Kim, Ki Deok
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - In this study, we characterized the bacterial strain KJ2CI2 in relation with its biocontrol activity against Phytophthora capsici on pepper, and identified this strain using morphological, physiological, biochemical, fatty acid methyl ester, and 16S rRNA gene sequence analyses. Strain KJ2C12 significantly (P=0.05) reduced both final disease severity and areas under the disease progress curves of 5-week-old pepper plants inoculated with P. capsici compared to buffer-treated controls. As for the production of antibiotics, biofilms, biosurfactant, extracellular enzyme, HCN, and swarming activity, strain KJ2C12 produced an extracellular enzyme with protease activity, but no other productions or swarming activity. However, Escherichia coli produced weak biofilm only. Strain KJ2C12 could colonize pepper roots more effectively in a gnotobiotic system using sterile quartz sand compared to E. coli over 4 weeks after treatments. However, no bacterial populations were detected in 10 mM MgSO4 buffer-treated controls. Strain KJ2C12 produced significantly higher microbial activity than the MgSO4-treated control or E. coli over 4 weeks after treatments. Bacterial strain KJ2C12 was identified as Bacillus luciferensis based on morphological, physiological, and biochemical characteristics as well as FAME and 16S rRNA gene sequence analyses. In addition, these results suggested that B. luciferensis strain KJ2C12 could reduce Phytophthora blight of pepper by protecting infection courts through enhanced effective root colonization with protease production and an increase of soil microbial activity.
AB - In this study, we characterized the bacterial strain KJ2CI2 in relation with its biocontrol activity against Phytophthora capsici on pepper, and identified this strain using morphological, physiological, biochemical, fatty acid methyl ester, and 16S rRNA gene sequence analyses. Strain KJ2C12 significantly (P=0.05) reduced both final disease severity and areas under the disease progress curves of 5-week-old pepper plants inoculated with P. capsici compared to buffer-treated controls. As for the production of antibiotics, biofilms, biosurfactant, extracellular enzyme, HCN, and swarming activity, strain KJ2C12 produced an extracellular enzyme with protease activity, but no other productions or swarming activity. However, Escherichia coli produced weak biofilm only. Strain KJ2C12 could colonize pepper roots more effectively in a gnotobiotic system using sterile quartz sand compared to E. coli over 4 weeks after treatments. However, no bacterial populations were detected in 10 mM MgSO4 buffer-treated controls. Strain KJ2C12 produced significantly higher microbial activity than the MgSO4-treated control or E. coli over 4 weeks after treatments. Bacterial strain KJ2C12 was identified as Bacillus luciferensis based on morphological, physiological, and biochemical characteristics as well as FAME and 16S rRNA gene sequence analyses. In addition, these results suggested that B. luciferensis strain KJ2C12 could reduce Phytophthora blight of pepper by protecting infection courts through enhanced effective root colonization with protease production and an increase of soil microbial activity.
KW - Antagonistic bacteria
KW - Bacillus luciferensis
KW - Biological control
KW - Phytophthora capsici
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U2 - 10.5423/PPJ.2009.25.1.062
DO - 10.5423/PPJ.2009.25.1.062
M3 - Article
AN - SCOPUS:77953544876
VL - 25
SP - 62
EP - 69
JO - Plant Pathology Journal
JF - Plant Pathology Journal
SN - 1598-2254
IS - 1
ER -